What does common multiple mean?

All nonzero numbers have multiples. Some numbers have some of
the same multiples as other numbers. These are known as common
multiples. 12 is a multiple of 3. 12 is a multiple of 4. 12 is a
common multiple of 3 and 4.
All non-zero numbers have multiples. Some numbers have some of the
same multiples as other numbers. These are known as common
multiples. 12 is a multiple of 3. 12 is a multiple of 4. 12 is a
common multiple of 3 and 4.